<?php
function RandAbc($length = "") { //返回随机字符串 
	$str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
	return str_shuffle($str); 
}
$str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
echo str_shuffle($str);
echo "<hr>";
echo str_shuffle($str);


?>